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We study the universal behavior associated with a Relativistic BoltzmannTransport (RBT) approach with the full collision integral in 0+1D conformalsystems. We show that all momentum moments of the distribution function exhibituniversal behavior. Furthermore, the RBT approach allows to calculate the fulldistribution function, showing that an attractor behavior is present in boththe longitudinal and transverse momentum dependence. We compare our results tothe far-from-equilibrium attractors determined with other approaches, such askinetic theory in Relaxation Time Approximation (RTA) and relativistichydrodynamic theories, both in their viscous (DNMR) an anisotropic (aHydro)formulations, finding a very similar evolution, but an even fasterthermalization in RBT for higher order moments. For the first time, we extendedthis analysis also to study the attractor behavior under atemperature-dependent viscosity $\eta/s(T)$, accounting also for the rapidincrease toward the hadronic phase. We find that a partial breaking of thescaling behavior with respect to $\tau/\tau_{eq}$ emerges only at $T \approxT_c$ generating a transient deviation from attractors; interestingly this inrealistic finite systems may occur around the freeze-out dynamics. Finally, weinvestigate for the first time results beyond the boost-invariant picture,finding that also in such a case the system evolves toward the universalattractor. In particular, we present the forward and pull-back attractors atdifferent space-time rapidities including rapidity regions where initially thedistribution function is even vanishing.

Far-from-equilibrium attractors with Full Relativistic Boltzmann approach in boost-invariant and non-boost-invariant systems